The inverter no-load current is greater than the load current

Stator Motors Rotor 

Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 

3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon Cause: a cement plant users to send a 75 kw can WIN - G9 frequency converter, the cause of the problem is, in the operation of the fire smoke in the inverter, the inverter downtime. Check, the power input circuit of the machine for three phase half controlled bridge, using the principle of controlled rectifier, on the main loop of the dc energy storage capacitor "soft power" and save the small power inverter commonly used rechargeable contactor. In fact half controlled bridge in this here is equivalent to non-contact soft blunt electricity switch. Inspection found that one of the thyristor module electrical motor 12v 1000w terminals have obvious signs of flashover arc burning, but the measurement is not short circuit. Found in the disassembly easily fixed nut landed, flashover reason seems to be a connecting screw loose, causing poor contact. The module for a combination of a diode and a one-way thyristor. And then check the control panel and inverter main circuit, without exception. The module, more than two phase half controlled bridge as the ac electric motor power input, after power on, with a small power 2.2 kW three-phase motor, feel no problem, switch to the new module after a same model, then to the site for installation. 


Y series totally enclosed protect Asynchronous motor
Specifications
1. 20 years manufacturing experience 
2. 12 months guarantee 
3. low noise and temperature rise 
4. high starting torque 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

Precaution, first will run to 5 hz frequency, frequency converter load as a fan, motor connector off first, make the motor no-load running. This trial run, got a fright! Frequency at 5 hz, no-load running current 45 a, although feel slightly larger, but consider for a possible repair, or frequency converter for motor winding parameters such as starting curve or torque compensation made adjustment caused by waiting for a reason, without notice. When up to 10 hz inverter panel shows the current and the output current is measured with clip-on table, have reached the 100 a! And the oscillation amplitude of the output current is great, but test the three-phase output voltage, about 70 v, balanced and stable. The motor cable release, electric logging on the inverter output, output frequency 10 hz, the output voltage is 70 v, 20 hz to 150 v, 35 hz to 250 v, after decreasing with frequency, to 50 hz, 400 v. In this process, the measurement of three-phase output voltage balance is very good. The inverter output of V/F curve electricalmotor1.blogspot.com accords with quadratic load torque characteristics. No problem. Output voltage balance and stability, and the output current is too large and the current volatility, obviously for the load caused by abnormal. This is lead to the conclusion of conventional judgment.

What maintenance electrician to specific professional skills

A door technology can foothold in society.Maintenance electrician belongs to technical professionals,our country is lack of senior technicians,if electric motor 12v 500w you learn good,also is very promising in the future.Main master electrician: maintenance electrician knowledge and basic skills,indoor wiring installation,grounding device installation and maintenance,repair and maintenance of common transformer,disassembling and maintenance of various commonly used motor,commonly used low voltage apparatus and distribution equipment installation and maintenance,motor control circuit basic installation and maintenance,commonly used machine tools installation and maintenance of electrical wiring,electronic circuit installation and debugging,acmotortrading.blogspot.com electrical control circuit design,programmable power electric motors controller and its application.As to hard to learn,the key see yourself don't work hard,go for it,have confidence in myself,should be able to learn well.

Pump and fan vane

Pump and fan is to use plus can denier conveying fluid permanent magnet motor fluid machinery.They are widely used in gas and heating and ventilation.According to the working principle of pump and fan,usually they can be classified as follows:Vane pump and the fan motor run capacitor is rotating,the main structure fixed casing and impeller blade.Of fluid work through the rotation of the impeller,allowing fluid to diesel generating gain energy.According to the fluid flow conditions,they then can be divided into the following several kinds: 1.wholesalemotor.blogspot.com The centrifugal pump and fan;2.Axial flow pump and fan;3.The mixed flow pump and fan,the fan is a combination of the first two.4.Tubular fan.

Single polarity can drive with dual polarity the gm?

Single polarity cannot be used instead of bipolar drive,drive and bipolar drive can be used instead

of a single polarity drives.Because of the two kinds of drive current distribution in different

ways,the effect of Y series three-phase asynchronous motor is different also.Single polarity drive (for example: HSM8672),with one polarity connection is dedicated to four phase stepper motor.For example,there are five lines,six lines,eight line lead electric motor cooling fan ways four phase stepper motor,can use

either single polarity drives,and to be able to use bipolar drive (for example: HSM1524-8).However,to achieve the best efficiency,or targeted to select the drive as well.Segmentation principle of stepping motor drive is what?If using subdivision driver,under the conditions of 10 subdivision drive the motor,step motor each run A micro,current changes in the winding is only 0.3 A,rather than 3 A,and the law of electric current is A sine curve changes,thus greatly improve the motor vibration and noise,therefore,on the performance of advantages is the real advantages of segmentation.Because subdivision driver to precisely control the motor phase current,so the driver electric motor cooling fan should have quite high technical requirements and technical requirements,the cost will also be higher.Note that there are some domestic drive "smooth" is used to replace the subdivision,sometimes also called segmentation,but it is not really a subdivision,hope the broad masses of users must distinguish the nature of the different:1."smooth" is not precise control of the motor phase current,but the rate of change of the current slow some,so "flat" do not produce micro step,and subdivision microstep can be used for accurate positioning.

After 2.The motor phase current is smooth,can cause the drop of the motor torque control and not only do not cause the decline of motor torque,on the contrary,the torque will be increased.For automated motion control system of step motor,there are mainly two phase,three-phase,four,five phase hybrid stepping motors.Must match the corresponding stepper motor drives,to be able to accept the controller (CPU,PLC,etc.) the digital signal.In order to reduce the

stepper motor work noise,usually using subdivision driver,especially at low speed working electricalmotor1.blogspot.com condition is

more noticeable.Many people know about "segmentation" is not special,just think,segmentation is in

order to improve the precision degree,actually otherwise,segmentation is mainly to improve the

performance of the three-phase asynchronous motor,now shows as follows: stepping motor subdivision

control is precisely controlled by the driver of stepping motor phase current,the two-phase motor,for

example,if the rated current of motor is 3 a,if you are using a conventional drive (such as a common

mode of constant current chopper) driving the motor,every step motor running,in its winding current

will mutations from 0 to 3 a or 3 a mutation to 0,the great changes in phase current,is bound to

cause vibration and noise of motor running.